“Polylactic acid (PLA) has broad application prospects in fields such as automobiles and electronic information, but its high flammability limits its application. There are many problems with traditional halogen flame retardants, and the development of new flame retardants is urgent. In recent years, inorganic nano flame retardants have become a research hotspot due to their unique advantages. The expert system reviewed the research progress of zero dimensional, one-dimensional, and two-dimensional inorganic nano flame retardants in the flame retardant modification of PLA. These flame retardants significantly improved the flame retardant performance of PLA and provided new ideas for solving the flame retardant problem of PLA.”